Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Feb. 03, 2018	Mar. 29, 2018	Jul. 28, 2017
Document and Entity Information [Abstract}
Entity Registrant Name	BEST BUY CO INC
Entity Central Index Key	0000764478
Document Type	10-K
Document Period End Date	Feb. 03, 2018
Amendment Flag	false
Current Fiscal Year End Date	--02-03
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 13.0
Entity Common Stock, Shares Outstanding		282,713,593
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY